Common faults There are two kinds of common faults: one […]
There are two kinds of common faults: one is high resistance fault, the other is low resistance fault. The so-called high resistance fault is that the cable is burnt, the instrument measuring resistance is large, or the insulation between phases or to the ground decreases, but there is a certain resistance value; the so-called low resistance fault is that the conductor is short or to the ground is completely short, the current increases, and power transmission trips occur. These two faults and their frequent occurrence pose a threat to the normal use of lawn lamps. Therefore, we must pay full attention to the causes and countermeasures.
Main Causes of Turf Lamp Failure
1. Poor construction quality
Faults caused by construction quality account for a large proportion. The main manifestations are as follows: first, the depth of cable trench is insufficient, and the sand cover brick is not constructed according to the standard; second, the production and installation of corridor pipes do not meet the requirements, and the two ends are not made into cough bells according to the standard; third, when laying cables, they are dragged on the ground; fourth, the embedded pipes of the foundation are not constructed according to the standard requirements, mainly because the embedded pipes are too thin, coupled with a certain degree of bending, it is very difficult to cross cables Difficult, there is a "dead bend" at the bottom of the foundation. Fifthly, the thickness of wire nose pressing and insulation wrapping is not enough, and after a long period of operation, it will be short-circuited.
2. Material fails
In recent years, the treatment of failure situation, the low quality of materials also has a lot of factors. The main performance is that the conductor contains less aluminium, the conductor is relatively hard, and the insulating layer is thin. This situation has become more common in recent years.
3. The quality of supporting projects is not very good.
Lawn lamp cables are usually laid on green belts. The pavement construction quality is poor and the ground sinks, which causes the cable to be deformed under force, leading to cable armor. Especially in the northeast of China, the arrival of winter makes the cable and soil form a whole. Once the ground subsides, it will be pulled at the bottom of the lawn lamp foundation. In summer, when rainwater comes, it will burn at the root of the foundation.
4. unreasonable design
On the one hand, it is overloaded operation. With the continuous development of urban construction, the lawn lamp also extends continuously. When new lawn lamp is built, it usually receives the circuit which is close to the lawn lamp. In addition, in recent years, the advertising industry has developed rapidly, and the advertising load is correspondingly connected to the lawn lamp, which makes the lawn lamp overloaded, the cable overheated, the wire nose overheated, the insulation reduced, and the occurrence of grounding short circuit. The design of lamp pole only considers the condition of lamp pole itself and ignores the space of cable head. When the cable head is wrapped up, most of the doors can not be closed. Sometimes the length of cable is not enough and the fabrication of joint does not meet the requirements. This is also the cause of failure.